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The article by Fernandez et al argues that, because of advances made inlaser-produced neutron pulses, it should now be possible to measure temperaturein samples loaded to elevated pressures, by neutron resonance spectrometry withneutrons accelerated using a single sub-picosecond laser pulse in the 300Jrange. We point out that the configuration used for neutron source and detectorwould require an infeasibly large sample, potentially requiring tens ofmegajoules of laser energy to drive the sample. The laser-driven neutrontechnology is thus not yet mature enough to consider for new facilities, andthe previously-demonstrated experiments at LANSCE still represent the onlycredible point design. We summarize some possible strategies for couplingbrighter neutron sources with dynamic loads.

Comment on J. Fernandez et al, "Requirements and sensitivity analysis  for temporally- and spatially-resolved thermometry using neutron resonance  spectroscopy," Rev. Sci. Instrum. 90, 094901 (2019)